rust: drm: gpuvm: implement Send and Sync for GpuVaAlloc and GpuVmBo

Moving a GpuVaAlloc or GpuVmBo between threads currently forces drivers
to write their own unsafe Send and Sync impls. Provide the markers in
the abstraction instead.

GpuVaAlloc wraps only uninitialised memory and exposes none of it.
GpuVmBo hands out the driver data and GEM object by shared reference and
drops them in its deferred put; the DriverGpuVm trait already guarantees
both are Send + Sync, so both impls are unconditional.

Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Link: https://patch.msgid.link/20260611-gpuvm-sync-send-v4-2-6c7f4ab2778a@google.com
Signed-off-by: Alice Ryhl <aliceryhl@google.com>

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